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Well the last photo I took had pretty decent exposure at 15 seconds.
Difference between f/16 and f/300 is four stops slower lens=less light.

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Click to expand...

I believe the difference is between 8 and 9 stops; ie.
f16-22-32-45-64-90-128-180-256-360
So about 8.5 stops
Of course calculations can be useful but in the end "cut and try" is the likely best way to arrive at a exposure solution. Just be sure to make notes.

Now I'm wondering if there is a certain amount of time during the image taking exposure that it takes the paper emulsion to "wake up" and start reacting - in other words a reciprocity factor is needed for exposures faster than 1 second or so. /QUOTE]

A late comment, but his would explain why exposing paper negatives (rated at ISO6) in a darkened room with an electronic flash gun whose GN was corrected from the ISO100 rating to and ISO6 rating DID NOT yield any image when the Multigrade paper was developed.
ps the flashguns give good images when used with film.
regards
Tony

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